Method and apparatus for measuring channel quality using a smart antenna in a wireless transmit/receive unit
First Claim
1. A method for measuring channel quality in a wireless transmit/receive unit (WTRU), the WTRU being equipped with a smart antenna for generating a plurality of beams, selected from the group consisting of directional beams and an omni-directional beam, the method comprising the steps of:
- (a) providing a dwell time in a measurement period to switch a beam from an active beam to a non-active beam, the active beam being a beam for communication with a serving base station;
(b) switching a beam to a non-active beam at the initiation of the dwell time;
(c) receiving signals from the serving base station and a non-serving base station through the switched non-active beam at the same time;
(d) generating samples of the received signals;
(e) storing the samples in a memory;
(f) measuring a channel quality to the serving base station and a channel quality to the non-serving base station, respectively, using the stored samples; and
(g) switching the beam back to the active beam.
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Abstract
A method and apparatus for measuring a channel quality in wireless transmit/receive units (WTRUs) which are equipped with a subscriber based smart antenna. The WTRUs are equipped with a smart antenna so that the WTRU generates a plurality of directional beams and, optionally, an omni-directional beam. A dwell time is provided in a measurement period to switch a beam from an active beam to a non-active beam. The active beam is one of the plurality of directional beams or, optionally, the omni-directional beam, for communication with one or more serving base station(s). A beam is switched to a non-active beam at the initiation of the dwell time. Signals are received through the switched non-active beam, and samples of the received signals are generated. The samples are stored in a memory. Channel quality is measured using the samples, whereby the dwell time to measure the channel quality is minimized.
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Citations
28 Claims
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1. A method for measuring channel quality in a wireless transmit/receive unit (WTRU), the WTRU being equipped with a smart antenna for generating a plurality of beams, selected from the group consisting of directional beams and an omni-directional beam, the method comprising the steps of:
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(a) providing a dwell time in a measurement period to switch a beam from an active beam to a non-active beam, the active beam being a beam for communication with a serving base station; (b) switching a beam to a non-active beam at the initiation of the dwell time; (c) receiving signals from the serving base station and a non-serving base station through the switched non-active beam at the same time; (d) generating samples of the received signals; (e) storing the samples in a memory; (f) measuring a channel quality to the serving base station and a channel quality to the non-serving base station, respectively, using the stored samples; and (g) switching the beam back to the active beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless transmit/receive unit (WTRU), comprising:
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a smart antenna configured to generate a plurality of beams, selected from the group consisting of directional beams and an omni-directional beam, an active beam being a beam for communication with a serving base station; a beam switching unit for switching beams; a sampler for generating samples of received signals received from the serving base station and a non-serving base station at the same time via one of the beams; a memory for storing the samples; a measurement unit for performing measurements of a channel quality to the serving base station and channel quality to the non-serving base station, respectively, using the stored samples; and a controller for switching a beam from an active beam to a non-active beam during a dwell time which is provided at least once in a measurement period and switching the beam back to the active beam, wherein the WTRU performs physical measurements of channel quality to the serving base station and channel quality to the non-serving base station using the stored samples such that the dwell time to measure the channel quality is minimized. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification